Portion of a shoe sole



FIG. 1 is a bottom plan view of a shoe sole showing our new design;

FIG. 2 is a front view thereof; and

FIG. 3 is a rear view thereof;

FIG. 4 is a bottom perspective view thereof;

FIG. 5 is a side view thereof; and,

FIG. 6 is another side view thereof.

The area within the solid and dash-dot lines forms the claimed design. The area within the broken lines is environmental and forms no part of the claimed invention. 

The ornamental design for a portion of a shoe sole, as shown and described. 